"[
ABSTRAKAliran PAS dibuat oleh Pekeris, Accad, dan Shkoller pada tahun 1973 sewaktu
melakukan studi tentang model aliran yang dapat membangkitkan proses dinamo.
Ternyata aliran PAS yang membangkitkan proses dinamo merupakan aliran
Beltrami. Berdasarkan definisi helicity yang dikemukakan oleh Moffatt, aliran
Beltrami memiliki helicity yang besar. Pada studi ini kita hitung seberapa besar
helicity aliran Beltrami tersebut. Untuk membandingkan besar helicity Beltrami
dengan helicity aliran yang lain maka kita hitung pula helicity salah satu aliran
non Beltrami, yaitu aliran Quasi PAS. Hasilnya menunjukkan bahwa helicity
aliran PAS lebih tinggi dari pada helicity aliran Quasi PAS.
ABSTRACTPAS flow created by Pekeris, Accad, and Shkoller in 1973 while conducting a
study on the flow model which can generate a dynamo process. Apparently that
PAS flow which generates dynamo process is a Beltrami flow. Based on the
definition of helicity proposed by Moffatt, Beltrami flow has a large helicity. In
this study we calculate how much the magnitude helicity of Beltrami flow. To
compare the magnitude helicity of Beltrami flow with another flow, we also
calculate helicity of a non Beltrami flow, that is Quasi PAS . The results show that
the magnitude helicity of PAS flow is higher than the magnitude helicity of Quasi
PAS flow ., PAS flow created by Pekeris, Accad, and Shkoller in 1973 while conducting a
study on the flow model which can generate a dynamo process. Apparently that
PAS flow which generates dynamo process is a Beltrami flow. Based on the
definition of helicity proposed by Moffatt, Beltrami flow has a large helicity. In
this study we calculate how much the magnitude helicity of Beltrami flow. To
compare the magnitude helicity of Beltrami flow with another flow, we also
calculate helicity of a non Beltrami flow, that is Quasi PAS . The results show that
the magnitude helicity of PAS flow is higher than the magnitude helicity of Quasi
PAS flow .]"
